Rails 3:如何在rake任务中呈现ERb模板？
Rails 3:如何在rake任务中呈现ERb模板？
提问于 2010-11-24 07:19:52
我正在用rake渲染一个相当大的站点地图HTML文件。不幸的是，当我迁移到Rails3时，代码崩溃了。我当前的代码如下所示：
@controller = ActionController::Base.new
@controller.request = ActionController::TestRequest.new
@controller.instance_eval do
@url = ActionController::UrlRewriter.new(request, {})
end
# collect data, open output file file
template = ERB.new(IO.read("#{RAILS_ROOT}/app/views/sitemap/index.html.erb"))
f.puts(template.result(binding))此代码在2.3中有效，但在Rails3中中断，因为url_for不再访问@控制器，而是控制器。(我认为这就是原因。)
undefined local variable or method `controller' for #<Object:0x3794c>
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:31:in `url_options'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_dispatch/routing/url_for.rb:132:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:99:in `url_for'
(erb):5
/Users/me/Documents/Projects/zvg2/lib/tasks/zvg.rake:452我还尝试创建一个ActionView来这样做：
av = ActionView::Base.new(Rails::Application::Configuration.new(Rails.root).view_path, {
# my assigns
}, @controller)
av.class_eval do
include ApplicationHelper
end
f.puts(av.render(:template => "sitemap/index.html"))但问题似乎是一样的，尽管ActionView::Base.new拿走了我的控制器。
undefined local variable or method `controller' for nil:NilClass
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/whiny_nil.rb:48:in `method_missing'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:31:in `url_options'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_dispatch/routing/url_for.rb:132:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:99:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_dispatch/routing/url_for.rb:132:in `url_for'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/helpers/url_helper.rb:99:in `url_for'
/Users/me/Documents/Projects/zvg2/app/views/sitemap/index.html.erb:5:in `_app_views_sitemap_index_html_erb__757224102_30745030_0'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/template.rb:135:in `send'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/template.rb:135:in `render'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications.rb:54:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/template.rb:127:in `render'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/render/rendering.rb:59:in `_render_template'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications.rb:52:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/activesupport-3.0.1/lib/active_support/notifications.rb:52:in `instrument'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/render/rendering.rb:56:in `_render_template'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.1/lib/action_view/render/rendering.rb:26:in `render'
/Users/me/Documents/Projects/zvg2/lib/tasks/zvg.rake:450使用使用url_for和link_to的rake呈现模板的最佳实践是什么？我敢打赌，由于Rails刚刚变得更加模块化，应该有一种简单的方法来解决这个问题。
提前感谢！1月
回答 4
Stack Overflow用户
回答已采纳
发布于 2010-11-24 17:14:24
当我包含Rails.application.routes.url_helpers而不是ActionView::Helpers::UrlHelper时，其中一种方法是有效的。目前，这是可行的：
include Rails.application.routes.url_helpers # brings ActionDispatch::Routing::UrlFor
include ActionView::Helpers::TagHelper
av = ActionView::Base.new(Rails.root.join('app', 'views'))
av.assign({
:regions => @regions,
:courts_by_region => @courts_by_region,
:cities_by_region => @cities_by_region,
:districts_by_region => @districts_by_region
})
f = File.new(file_name, 'w')
f.puts(av.render(:template => "sitemap/index.html"))
f.close希望这对其他人有帮助。如果有更好的解决方案，我会很感兴趣。
另外，如何从绑定中自动获取赋值的散列？
Stack Overflow用户
发布于 2011-01-24 07:06:52
我成功地做了这样的事情：
class Template < ActionView::Base
include Rails.application.routes.url_helpers
include ActionView::Helpers::TagHelper
def default_url_options
{host: 'yourhost.org'}
end
end
template = Template.new(Rails.root.join('app', 'views'))
template.assign(attendee: @attendee)
template.render(template: 'sitemap/index.html.erb')Stack Overflow用户
发布于 2011-07-21 16:07:14
这就是对我有效的方法(Rails 3)：
class TaskActionView < ActionView::Base
include Rails.application.routes.url_helpers
include ApplicationHelper
def default_url_options
{host: 'example.com'}
end
end
def action_view
controller = ActionController::Base.new
controller.request = ActionDispatch::TestRequest.new
TaskActionView.new(Rails.root.join('app', 'views'), {}, controller)
end
action_view.render(:template =>"path/to/template")这成功地包含了我的应用助手、标签助手和url助手。您需要将您的应用程序/环境主机正确地放入default_url_options散列中。
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原文链接：
https://stackoverflow.com/questions/4262044
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